Picture-exhibiting apparatus.



U. L. THOMSEN.

PICTURE EXHIBITING APPARATUS.

APPLICATION FILED MAY 16, 1911.

1 ,O24;,955, Patented Apr. 30, 1912.

min asses flue/aim" COLUMBIA FLANOGRAPH co.. WASHINGTON. n. c.

Cbr/ Mar/f2 772007660 UNITED STATES PATENT OFFICE.

CARL LAURITZ THOMSEN', OF COPENHAGEN, DENMARK.

PICTURE-EXHIBITING APPARATUS.

To all whom it may concern Be it known that I, CARL LAURITZ THOM- SEN, citizen of the Kingdom of Denmark, and a resident of lVodrofsplads 14, Copenhagen, Denmark, engineer, have invented new and useful Improvements in Picture- Exhibiting Apparatus, of which the following is a specification.

My invention concerns an apparatus for the automatic exhibition of alternating transparent pictures and advertisements.

The invention specially applies to an apparatus which automatically, at suitable intervals, exhibits a fresh picture.

The invention is shown on the accompanying drawing where- Figure 1 shows a schematic outline of the mechanism of motion, while Fig. 2 shows the arrangement of the pictures and their cylinders, and Fig. 3 shows the method of procedure for the uniting of the individual pictures.

The apparatus consists of a box or cabinet, containing two cylinders one of which always serves for rolling up and the other for unrolling. Each individual picture is pasted upon a piece of canvas 1, which is furnished with channels 2, in such a manner that the parts can be assembled by bringing a stick down through the short individual parts of the running channels, in such a manner that the latter form a kind of hinge, as shown in Fig. 3. In this manner there is formed of single pieces a roll of suitable length which is rolled up on one of the cylinders 4. It will be seen, that, in the manner here described, each single picture can easily be removed and replaced by another. The roll is carried over a couple of conducting cylinders 5, in order to preserve the same distance between the sheet and the glass.

The apparatus is worked in the manner that after a suitable interval, one of the cylinders (the rolling up cylinder) is turned so much that a fresh picture comes before the glass in the front of the cabinet. As soon as it has reached its place, the cylinder must be stopped until it again, after an interval previously determined upon, shall again be set in motion, in order that the next picture can be brought before the glass; finally the power, when the one cylinder is rolled up, must be transmitted to the other, which thereby becomes the rolling up cylinder, so that the pictures will now return the opposite way. In order to carry this Specification of Letters Patent.

Application filed May 18, 1911.

Serial No. 627,905.

out, the following arrangements have been made. 6 is the source of'power which in the drawing is shown as an electric motor, but can, however, consist of any other motive power. The motor is driven at uniform speed, and transmits the motion to a shaft 7 carrying a wheel 8, whence the motion by means of suitable gear is transmitted to the shaft 9. This shaft has a conical cog wheel, which engages another conical cog wheel on the shaft 10. On this -shaft there is a cam disk 11 with a cam 12. The shaft 7 has likewise a clutch 13, which is connected with the shaft 14. From this shaft the motion is transmitted to the shaft 15, which has a cog wheel 16, and this engages one of the two cog wheels 17 and 18, of which the cog wheel 17 is fixed upon the shaft 19, which by means of a couple of cog wheels 20 and 21 transmits the motion to the shaft carrying the one cylinder 4; in like manner the cog wheel 18 is fixed upon the shaft 22, which transmits the motion to the shaft 23, on which the other cylinder 4 is placed. The clutch 13 can be pulled in by the double armed lever 24 which can turn on the pivot 25, the one end of which is attached to the clutch, while the other end rests upon the cam 12. The unclutching takes place through another double armed lever 26 turnable on the pivot 27. The-free end of the lever 26 is formed like an armature 28 for an electromagnet 29. Moreover, the lever is actuated by a spring 30. Finally upon the shaft 14 is fixed a spring 31. The electromagnet 29 has a circuit in which is inserted a switch 32 (Fig. 2) which presses against a contact spring 33, which is kept against switch 32 by a spring 34; this place of contact is placed just over the web so that the collecting sticks 3 during their travel can come between switch 32 and the spring 33 and thus break the current.

The apparatus acts in the following manner: A uniformly rotating motor 6 keeps the shaft 7 and the shaft 10 in an equably rotating motion; upon the rotation of shaft 10 each time the shaft has made one revolution, the cam 12 will pass in front of the roll at the end of the lever 24, the latter will by this means turn and throw in the clutch 13, whereby the shaft 14 will be set inmotion. This motion is transferred by the shaft 15, the cog wheels 16, 17 and 20 to the right hand cylinder 4, which in consequence turns and rolls the web up. As soon as the Patented Apr. 30,1912. 7

movement of the roll has commenced the end of the stick 3 comes out of the space between switches 32 and 33 and the current will now be closed through the electromagnet 29, which will immediately attract its armature 28. The cam 12 will by reason of the continued rotation of the shaft 10 quickly free itself from the roller on the lever 24, but the clutch will, nevertheless, continue to be drawn in by the eleotromagnet 29 and the right hand cylinder will. consequently continue to revolve until the illuminated picture has been rolled up and a fresh picture has replaced it. At this moment the next stick 3 enters between the switch 32 and spring 33 and switches off the current in the eleetromagnet The spring 30 will then turn the lever 26 and thus nncouple the clutch 13, in such a manner that the movement of the shaft 14 is stopped. The cylinders are 110w in repose, until the cam 12 has again made one revolution. The time which it takes for the cam 12 to make one revolution can be varied by the insertion of a greater or lesser gearing. By this means at intervals previously determined a fresh picture will be brought before the glass, until the whole web has been rolled up on the one cylinder and rolled off the other. In order to give the web a retrograde movement, the movement must be changed in such a way that the cylinder which before was the rolling up one now becomes the unrolling one, and vice versa. In order to effect this change, the following arrangements have been made: One of the shafts of the cylinders 4. (on the drawing shaft 23 is shown) has a screw cut spindle extension 35, on which a bushing 36 can travel, and this is furnished with a fork 37, which carries a sheath 38 on the shaft 39 in the fork 10, which forms the one end of a double armed lever 41 which is revoluble around the pivot 42. The'other end of the lever 11 carries a contact 13, which can engage respectively contact 14 and 15.

The previously mentioned cog wheel 16 is fixed upon an extending bushing on the shaft 15. The bushing can be moved by a double armed lever 16 revoluble upon a pivot 4:7. The free end of the lever is formed like an armature 48, which can be attracted by the two opposing electromagnets 4-9 and 50. The circuits for the electromagnets are arranged in such a manner that the contacts 4:4 are in circuit with the electromagnet 49 and the contacts 45 in circuit with the electromagnet 50. Vhen one of the cylinders has been entirely unrolled the nut 36 is pushed completely down or up, and the fork 37, which travels along the sheath 38, will under the influence of the fork 37 expand or contract the spring 51, until the lever 11 turns and switches off the one of the sets of contacts 4st or 15 and closes the second switch. In the above men tioned instance when the nut 36 has reached the whole distance, the cont-act 43 will disengage from the contacts 14:, whereby the electromagnet 19 is without current and will engage the contacts i5, so that-the electromagnet 50 gets current. This will immediately attract the armature 4S and thereby turn the lever 16, in such a manner that the cog wheel 16 is now put out of contact with the cog wheel 17 and engaged with the cog wheel 18.

lVhat I claim, and desire to secure by Letters Patent is:

The combination of a pair of rollers over which. a web travels, shafts having connection with respective ones of said rollers, and each provided with a gear wheel, a shaft in two parts, a clutch connecting said shaft parts, means to constantly drive one of said shaft parts, a gear wheel shiftable to engage either of said first named gear wheels and having connection with the other shaft part, means to shift said last named gear wheel at the end of the travel of the web in one direction, and means to intermittently en gage and disengage said clutch.

Signed by me at Copenhagen, Denmark, this 21st day of April 1911.

CARL LAURITZ THOMSEN.

\Vitnesses CHARLES HUDE, RreUs HANSEN.

lopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

